| Aiming at the voltage resonance in the the resonant earthed system caused by the inductance of arc suppression coil and the ground capacitive, a new kind of arc-suppression grounding device based on PWM converter is proposed in the paper. The models of medium voltage network,PWM converter and the controller are created and the modeling is simulated with MATLAB/Simulink,the primary study and theory analysis are performed from two aspects: selection of main circuit topology-structure and operation-control strategies. Operation contains dc-link capacitor charging in advance,measurement of capacitive currents of power systems to ground and launch-quit strategy. The device is designed with the TMS320F2812PGFA and PM30CSJ060,and its max compensation current is 30 A. The simulation and analysis are presented to indicate some feasibility of modifying the extinction coil by power electronic theory and technology. |
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